Grate bar



Patented Jane 3, 1930 I A I a Lmwza UNH'ED STATES PATENT QFFICE ANATOLE PROVOS'I, OF. MONTREAL, QUEBEC, CANADA GRATE BAR Application fileana 1c, 1929. Serial in. 363, 06. This invention relates broadly" to furnace Referring to the drawings grates and more particularly to grates adapt- Fig. 1 is a fragmentary cross sectional ed for burning finely divided fuel suchas yiew-of a grate formed according to the sawdust, chips or the smaller grades of coal invention.

known as pea coal, screenings and the like, F ig. 2 is a perspective view of one of and the objects of the invention are to prothe bars. 1 Y

vide a grate composed of a series of bars Referring more particularly to the drawso interlocked that each bar is held against ings, 11 designates one of any suitable numaccidental removal and against warping by her of cross bearers formed in its upper 10 the adjoining bars, and also to provide bars edge with two series ofn'otches 12 and 12 so formed as to define tortuous air passages and a notch 13 located between the two first therebetween through hi h th fin ly dinamed series. The notches 12 and 12 each vided fuel will not pa r dil have one substantially vertical edge 14 and A further object is to provide bars so one materially inclined edge 15. The Ver- 15 formed and arranged that they positively tlcal edges 14 of the notches of one series hold one another against ov tur i face the corresponding vertical edges of the A still further object is to provide for the t hes of the other series as clearly shown. easy removal of the bars when renewal is The notch 13 ay be Very shghtly tapermg necessary 1 as shown, or may be otherwise formed.

20 'Various other objects and the advantages TWO Serles f I y 6 lJrOVlCled may be ascertained from the following 'dend are, exactly'slmllar except that they are scription and the accompanying drawings; formed or arranged left hand and rlght hand.

The invention resides; broadly speaking, Each bar presents 2L SllbSllill'ltlZLllf/ VGIl'JlCELl in providing a series of bars each having a pp fl r ce 1 substantlally 25 longitudinal groove in one side surface and Vertical lower flank Surface 19 and one I a longitudinal rib in th o p it id teriallyincline-d lower flank surface 20,. the face adaptedto enter the groove of the ad l l l Whlch COITQSHOHdS h joining bar, so as to for to t passages IHClIIIatIOII'Of the edges 15 of'the notches in between the bars through which finely dithe r ss hearers 11. Between the uppfifl vided fuel will n t r adily a prior t lower vertical flank surfaces, each bar is pro being burned. The bars are adapted for Vided With & g ud groove 3 l assembly by a combi d d d or 1%. tween the upper Vertical and lower inchned eral motion and a pr f rabl arranged i flanlrsurfaces, each bar is provided w th a sets with key bar b tw th ts Serving longltudlnal r1b, 22 at the same level aslts 35 to hold the bars of the sets against the lateral F The Gross 5665101131 P l o the motion necessary forseparation. The bars r1b and g y of each bar are l, 50 are supported by cross bearershaving bar that the i f one bar may enter h groove receiving notches preferably formed with of the adlommg bar when the bars are uitably spaced the surface of the rib and 40 one edge substantially vertlcal and the other S V v edge mchned' one Side Surface of h bar the surface of the groove filll define a toltu ous assa e of subst ntiall uniform width. below the groove or r1b 1s substantlally verp c V Preferabl the lower surface of each rib is heal Whlle the correspondmg portlon of the continuou s with the lower inclined flank sur- Other slde l' 1s mate/many inclined to face 20. Spacin lu s 23 are provided on the 5 correspond with the inclination of the notch a d e f fil l t d i th v s 9 g and the a1:1'angement of bars, in the 21, butmay be located upon theribs 22. These grate 1s such that lntroduction of the key bar l a fl-shaped, as shown in Figure 2, so or'barsforces the vertical surfaces of the adthat they will, not only space the bars apart j Jo1n ng bars against the vertical edges of but will also centre the ribs in the grooves 50 retainingnotches'. i

and operate to hold the bars against indebar.

pendent vertical movement while the engagement is maintained. Starting at the opposite sides of the furnace, the bars are placed upon the cross bearers with a downward and outward movement corresponding substantially to the inclination of the notch edges 15 and, when thus inserted, the groove of each bar moves into embracing engagement with the rib of tile previously inserted bar.

At the centre of the furnace, a key bar 24 is provided having a fiat top and upper su stantially vertical flanking walls, as in the case of the other bars. The intermediate por tions of the flanking walls, designated 25, converge sharply at approximately the incli nation of the upper edges of the adjoining ribs 22, a d the lower flanking walls 26 are substantially vertical or converge slig itly according to the shape of the retaining slo 13. The intermediate flanking walls 25 provided with spacing lugs 21' to rest upon and enter between the ribs of the adjacent bars 16 to hold these bars against inward and upward movement necessary to disengage them from the bars outside them. The action of the key bar 241- is similar to the action of the key-stone of an arch and, when in place holds the lower vertical. flanks 19 or the 16 against the vertical edges Llof the notches, so that the bars are held agai st rocking or overturning.

Between the vertical upper flank s r ces 18, is provide lone or more lugs 28, said lugs preferably forming part of one of said surfaces and are adapted to continuousl keep said bars at a suitable distance from one another, thus eliminating the danger of clogging.

lhe key bar 2st is preferably provided at its lower end with an GIllS-I. (l portion 29 which is centrally bores uric threaded, and

adapted to be engaged by the elongated bolt 30. The belt is adapted to pass through a rod or tubular member 31 which engages the underside of the cross bearers ll, said bolt then engaging the threaded hole in'the key The object of this attachment is for firmly securing or looking the key to the cross bearers.

While the description thus far plates only one set of right hand set of left hand with a single key bar between them in the centre of the furnace, it will be understood that a complete grate may consist of as many series of bars and as many key bars as desired.

It will readily be seen from the drawings that each bar (excepting the key bar) is held against vertical movement relative to the adjoining bars by reason of engagement of its ribs in the groove of one adjoining bar (the relation of the faces and 26 of the key bar being considered as forming a groove) and by reason of the rib of the other adjoining bar entering the groove. T his interlockcontemand one ing is effected at various points in the length of the bar according to the number of spacing lugs used and the bars may therefore be described as longitudinally interlocked. This longitudinal. interlocking holds the bars securely against accidental displacement and also in large measure against warping. The ribs 22 form obstructions in the spaces between the upper vertical fianks of adjoining bars and in large measure prevent small parti les of unburned fuel passing between the bars and being lost without obstructing the flow of air between the bars.

Having thus described my invention, What I claim is 1. A furnace grate unit having removable fuel supporting bars comprising a supportmg member, a central bar detachably secured on the supporting member, a plurality of second bars mounted on thesupporting mem- .ber symmetrically disposed on each side of the central bar, means onthe central bar for holding the adjacent bars against vertical movement, and means on the outer sides "of each of-the second barsforengaging the inner sides of the adjacent'barsto prevent relative vertical movement therebetween.

2. A furnace grate unit havingremovable fuel supporting bars comprising a supporting member,a central bar detachably secured on the supporting member, a plurality of second bars mounted on the supporting member and symmetrically disposed 011 eachside of the central bar, means on the central bar for holding theadj acent'secon'd bars against vertical movement and for holding the central bar and the adjacent second bars in spaced relation, andmeanson the outer sides ofeach of the second bars for engaging the inner sides of the adjacent second bars to prevent relative vertical movement therebetween and to hold the said bars in spaced relation.

8. A furnace grate unit having removable fuel supportingbars comprising a supporting member, a central bar detachably secured on the supportingmember, a plurality of second bars mountedon the supporting member and symmetrically disposed on each side of the central bar, a depression on each side of the central bar, complimentary projections on the inner side of each adjacent second bar, bar spacing and interlocking lugs fitted into the depressions in thecentral bar and adapted to engage the complimentary projections on the adjacent second bars whereby the adjacent bars are held in spaced relation to the central bar and are held against vertical movement relative to the central bar,,and tortuous air passages are formed between the central bar and each of the adjacent second bars, a depression inthe outer side of each of the plurality of secondbars, a complimentary projection on the inner side of each of-the adjacent second bars, and bar spacing and interlocking lugs fitted into the depression in ies the outer side of each second bar adapted to engage the complimentary projection on the inner side of each adjacent bar whereby each second bar is held in spaced relation to the adjacent bars and each second bar is held against vertical movement relative to the adj acent second bars, and tortuous air passages are formed between the adjacent second bars. 4:. A furnace grate unit having removable fuel supporting bars comprising a supporting member which has a central depression and a plurality of second depressions symmetrically disposed on each side of the central depression, each of said second depressions having an outer vertical side and an inner inclined side, a central bar detachably secured in the central depression of the supporting member, a plurality of second bars symmetrically disposed on each side of the central 28 bar, said second bars being shaped to fit into the secondary depressions in the supporting member, a depression on each side of the central bar, complimentary projections on the inner side of each adjacent second bar, bar 5 spacing and interlocking lugs fitted into the depressions in the central bar and adapted to engage the complimentary projections on the adjacent second bar whereby the adjacent second bars areheld in spaced relation to the to central bar and are held against vertical movement relative to the central bar, and'tortuous air passages are formed between the central bar and each of the adjacent second bars, a depression in the outer side of each of the plurality, of second bars, a complimentary projection on the inner side of each of'the adjacent second bars, bar spacing and interlocking lugs fitted into the depression in the outer side of each second bar adapted to en- 40 gage the projection on the inner side of each adjacent bar whereby each second bar is held in spaced relation to the adjacent bars and each second bar is held against vertical movement relative to the adjacent second bars, and tortuous air passages are formed between the adjacent second bars, spaced lugslocated on the vertical sides of the central bar and near the top thereof, and spaced lugs located on the outer vertical side of each second bar and near as the top thereof, whereby lateral movement of each bar relative to the adjacent bars is deterred. s In testimony whereof I affix my signature.

ANATOLE PROVOST. 

